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@PHDTHESIS{Gach:993080,
      author       = {Gach, Stefan},
      othercontributors = {Reisgen, Uwe and Kannengießer, Thomas},
      title        = {{V}erzugsminderung durch {V}olumenexpansion einer
                      kontrollierten martensitischen {P}hasenumwandlung in
                      {S}trahlschweißprozessen},
      volume       = {2024,4},
      school       = {RWTH Aachen University},
      type         = {Dissertation},
      address      = {Düren},
      publisher    = {Shaker Verlag},
      reportid     = {RWTH-2024-08591},
      series       = {Aachener Berichte Fügetechnik},
      pages        = {1 Online-Ressource : Illustrationen},
      year         = {2024},
      note         = {Druckausgabe: 2024. - Auch veröffentlicht auf dem
                      Publikationsserver der RWTH Aachen University; Dissertation,
                      RWTH Aachen University, 2024},
      abstract     = {Low transformation temperature (LTT) materials have been
                      designed as additive materials to reduce tensile residual
                      stresses in high-strength fine-grained structural steels.
                      These materials utilize the volume expansion effect during a
                      martensitic transformation that be-gins at reduced
                      temperature. This volume expansion counteracts the volume
                      shrinkage, which is the cause of component distortion,
                      during cooling. The positive effects of these LTT alloys on
                      tensile residual stress loading have been demonstrated in
                      various investigations, primarily in the area of arc
                      welding. Due to the reduction in tensile stress, these
                      materials also offer the potential to have a positive effect
                      on component distortion. In contrast to the arc processes
                      described in the literature, where LTT material is added in
                      wire form in large volumes, the filler material in beam
                      welds takes up a much smaller pro-portion. An in-situ
                      alloying of the LTT structure, consisting of filler material
                      and base material, takes place, since, depending on the
                      filler ratio, the phase transformation takes place at a
                      reduced martensite start temperature. In the present work, a
                      concept is developed and tested for using these materials in
                      beam welding processes with the aim of minimizing
                      distortion. The approach follows a modular design principle.
                      Individual methods, metallurgical, analytical process
                      engineering or simulative in nature, are examined regarding
                      their contribution to mastering the LTT concept. In
                      combination, the methods provide the possibility to apply
                      the LTT concept in beam welding and to test it on more
                      complex geometries in the future. The outlook provides an
                      example of a possible application of the LTT concept to
                      minimise distortion in an example application in rail
                      vehicle construction. The individual methods of the modular
                      principle are extrapolated and applied on a theoretical
                      basis.},
      cin          = {417610},
      ddc          = {620},
      cid          = {$I:(DE-82)417610_20140620$},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      doi          = {10.18154/RWTH-2024-08591},
      url          = {https://publications.rwth-aachen.de/record/993080},
}